JP2001309160A - Overlay display controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overlay display controller that can easily discriminate screen overlays such as a mouse cursor, a text cursor, a window moving frame, a window size revision frame and a range selection frame that are marks of operations and operation contents from a background image in the case of conducting various operations in a system such as a work station, a personal computer, and a word processor. SOLUTION: The overlay display controller is provided with a shape decision means that decides a shape of overlays displayed on a screen and with a position decision means that decides positions of the overlays on the screen and a predetermined constant is added to pixels of parts on which the overlays are superimposed among pixels displayed on the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlay display control device, and more particularly, to a mouse cursor, a text cursor, a window moving frame, and a window, which are used to mark the operation position and operation contents in the operation of a workstation, a personal computer, a word processor, and the like. The present invention relates to an overlay display control device such as a size change frame and a range selection frame.

[0002]

2. Description of the Related Art In order to satisfactorily identify an overlay display such as a mouse cursor, a text cursor, a window moving frame, a window size change frame and a range selection frame, which is displayed on a background image displayed on a screen, from the background image. There is known a display control device that displays the color of an overlay display portion where a background image and a foreground image overlap with each other with an inverted color of the background color.

FIG. 17 is a block diagram for explaining a conventional overlay display control device. A conventional overlay display control device is used to associate an input device 1701 such as a mouse for moving an associated overlay display on a monitor screen by moving the operator with the mouse and an amount of mouse movement to the movement of the overlay display on the monitor screen. A moving amount detecting unit 1702 for detecting the moving amount, a display position storing unit 1704, and a moving amount detecting unit based on the position of the upper left corner which is the current display position of the overlay display stored in the display position storing unit 1704. A display position determining unit 1703 that outputs a position moved by the moving amount of 1702, a shape determining unit 1705 that outputs overlay display shape data, a display control unit 1706, and a pixel value of an image output on a monitor screen are displayed. The stored image memory 1708 and the display controller 1706 for deleting and updating the overlay display A pixel operation unit 1707 to retrieve the pixel from the image memory 1708 based on the input is configured by a pixel inversion unit 1709 for inverting the background color of the overlay display portion overlapping the background image and the foreground image. Next, the operation will be described.

[0004] First, the movement amount detection unit 1702 detects the movement amount of the mouse. The detected movement amount is used as a display position determination unit 1
703. If the movement amount is not 0, the display position determining unit 1703 outputs the display position of the movement destination based on the current display position of the display position storage unit 1704. After confirming that the mouse movement amount is not 0, the display control unit 1706 controls screen updating. In order to update the screen, the display control unit 1706 compares the output of the display position storage unit 1704 that stores the current display position of the mouse cursor and the output of the shape determination unit 1705 that outputs the shape data of the mouse cursor with the pixel operation unit 1707. Output to The display position of the display position storage unit 1704 stored in the image memory 1708 is stored in the area of horizontal pixels × vertical pixels of the shape determination unit 1705, and the pixel value of each color channel of the pixel to be superimposed on the overlay display is determined by the pixel operation unit 1707 And a pixel inverting unit 1709 inverts the pixel value of the color channel. By writing the inverted pixel value in the image memory 1708, the overlay display can be deleted from the monitor screen.

Next, the output of the display position determining unit 1703 for outputting the destination position of the overlay display by the display control unit 1706 and the output of the shape determining unit 1705 for outputting the shape data of the overlay display are sent to the pixel operating unit 1707. Output.
The display position of the display position storage unit 1704 stored in the image memory 1708 is stored in the area of horizontal pixels × vertical pixels of the shape determination unit 1705, and the pixel value of each color channel of the pixel to be superimposed on the overlay display is determined by the pixel operation unit 1707 And a pixel inverting unit 1709 inverts the pixel value of the color channel. The inverted pixel value is stored in the image memory 170.
8, the overlay display of the destination can be performed.

FIG. 3 is a diagram showing a state of overlay display drawn on a screen. FIG. 4 is a diagram in which the overlay shape data shown in FIG. 3 is binarized. For example, FIG.
If the hatched portion is a portion displayed as a 5 × 5 overlay, the overlay shape data corresponding to this portion is represented by binary values as shown in FIG. FIG. 4 corresponding to the pixel 301 in FIG.
The overlay shape data is "1" like the pixel 401 in FIG.
In the case of (2), overlay display is performed. When the overlay shape data is “0” as in the pixel 402 of FIG. 4 corresponding to the pixel 302 of FIG. 3, the overlay display is not performed.

FIG. 5 is a diagram showing output characteristics of an overlay pixel value in a conventional overlay display control device.
If the background pixel value at the position where the overlay is displayed is x, the pixel value of the overlay display portion is y, the color channel of the pixel is 1 channel, and the quantization bit is 8 bits, the overlay pixel value is the inverse of the background pixel value, so y = 255-x, and the graph 501 is obtained. In order to make it easier to understand the state of the overlay pixel value with respect to the background pixel value, the graph 502 shows the background pixel value as y = x. At this time, for example, when a uniform screen having a luminance of 63 is displayed, the luminance of the overlay display has a value of 192 indicated at the position 503, and the difference between the luminance of the peripheral pixel and the luminance indicated by 504 (129)
), The overlay display can be recognized.

[0008]

However, in the conventional overlay control display device described above, the graph 502 indicating the background pixel value and the graph 501 indicating the overlay pixel value intersect as shown in FIG. When the background pixel value at which this graph intersects is near half of the maximum value, the inverted pixel value of the overlay pixel value is also near half of the maximum value,
Both pixel values become very close values.

For example, when a uniform screen with a luminance of 127 is displayed, the luminance of the overlay display becomes a value of 128 indicated at the position 505, and the peripheral pixel and the arrow 506 are displayed.
In this case, there is a problem that the overlay display melts into the background image and is difficult to determine.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a constant pixel value regardless of the pixel value of a background image displayed on a screen. An object is to obtain an overlay display control device that displays a foreground image having a difference.

[0011]

An overlay display control device according to the present invention (claim 1) is an overlay display control device for displaying an overlay by superimposing a foreground image on a background image displayed on a screen. A display position determining unit that determines a display position of the foreground image, a shape determining unit that determines a shape of the foreground image, an image storage unit that stores pixel values of the background image, and a storage unit that is stored in the image storage unit. A pixel operation unit that extracts a pixel included in an area having a shape determined by the shape determination unit at a position determined by the display position determination unit in a background image that is present, and extracted by the pixel operation unit. A pixel adding unit that adds a predetermined constant pixel value to the pixel value of the background image, sends the added pixel value to the image storage unit, and displays an overlay on the screen. Those were example.

According to a second aspect of the present invention, in the overlay display control apparatus according to the first aspect, when the quantization bit overflows by adding the predetermined constant, the number of pixel gradations is reduced. When the flow is performed, the number of pixel gradations is added.

According to a third aspect of the present invention, in the overlay display control device according to the second aspect, the predetermined constant is a half of the number of pixel gradations.

According to a fourth aspect of the present invention, there is provided an overlay display control apparatus for displaying an overlay by superimposing a foreground image on a background image displayed on a screen. A display position determination unit that determines the shape of the foreground image, an image storage unit that stores the pixel values of the background image, and a background image stored in the image storage unit. A pixel operation unit for extracting pixels included in an area having a shape determined by the shape determining unit at a position determined by the display position determining unit, and an overlay among pixels displayed on a screen. A pixel addition unit that adds a predetermined constant to the pixel value when the pixel value is within a predetermined value range for the pixel of the superimposed portion; When out of range of serial predetermined value is obtained by a pixel inversion section subtracting the pixel value from the maximum value of the pixel gray scale of the pixel values.

According to a fifth aspect of the present invention, there is provided an overlay display control device for displaying an overlay by superimposing a foreground image on a background image displayed on a screen. A display position determination unit that determines the shape of the foreground image, an image storage unit that stores the pixel values of the background image, and a background image stored in the image storage unit. A pixel operation unit for extracting pixels included in an area having a shape determined by the shape determining unit at a position determined by the display position determining unit, and an overlay among pixels displayed on a screen. If the pixel value of the superimposed portion is smaller than a predetermined threshold value, the maximum value of the pixel gradation is given to the pixel, and the pixel value is given in advance. In the case of more than the threshold is obtained by a pixel processing unit for giving the minimum value of the pixel gradation to the pixel.

According to a sixth aspect of the present invention, in the overlay display control device according to the fifth aspect, the predetermined threshold is half the maximum value of the pixel gradation.

According to a seventh aspect of the present invention, in the overlay display control device according to any one of the first to sixth aspects, the shape of the overlay determined by the shape determining unit is a shape of a mouse cursor. To create.

According to the present invention (claim 8), in the overlay display control device according to any one of claims 1 to 6, the shape of the overlay determined by the shape determining unit is such that characters are edited when text is edited. This is to create the shape of a text cursor pointing to the editing position.

According to a ninth aspect of the present invention, in the overlay display control device according to any one of the first to sixth aspects, the shape of the overlay determined by the shape determining unit is determined when the window is moved. To create the shape of the window moving frame pointing to.

According to a tenth aspect of the present invention, in the overlay display control device according to any one of the first to sixth aspects, the shape of the overlay determined by the shape determining unit is determined by the size of the window. When the window size is changed, a shape of a window size change frame indicating the size of the window after the change is created.

According to the present invention (claim 11), in the overlay display control device according to any one of claims 1 to 6, the overlay shape determined by the shape determination unit is to be edited on a screen. A shape of a range selection frame indicating a range is created.

[0022]

Embodiments of the present invention will be described below. (Embodiment 1) FIG. 2 is a block diagram for explaining an overlay display control device according to Embodiment 1 of the present invention. The overlay display control device according to the first embodiment of the present invention includes an input device 201 such as a mouse for moving an associated overlay display on a monitor screen by moving an operator, and an overlay amount on the monitor screen for moving the mouse. A movement amount detection unit 202 for detecting a movement amount to correspond to a movement of the display, a display position storage unit 204, and a position of an upper left corner which is a current display position of the overlay display stored in the display position storage unit 204 A display position determining unit 203 that outputs a position moved by the moving amount of the moving amount detecting unit 202, a shape determining unit 205 that outputs shape data of the overlay display, a display control unit 206, Memory 208 which stores the pixel values of the image to be displayed, and a display control unit 206 for deleting and updating the overlay display. Image memory 208 input to the original
And a pixel addition unit 209 that adds a predetermined constant pixel value to the pixel value of the foreground image extracted by the pixel operation unit 207.

Here, the operation timing of the overlay display control device according to the first embodiment will be described with reference to the flowchart of FIG. FIG. 6 is a flowchart showing a processing procedure of the overlay display control device according to the first embodiment of the present invention. In FIG. 6, first, in step S601, the movement amount of the mouse is detected. Next, step S602
Then, the moving amount detected in step S601 is 0
In the case of, the process returns to step S601 to perform the operation of moving amount detection again. Therefore, when there is no movement of the mouse, the operations of steps S601 and S602 are repeated. At this time, in FIG. 2, the movement amount detection unit 202 outputs to the display control unit 206 that the movement amount of the mouse is 0. The display control unit 206 does not output anything to the pixel operation unit 207 because the movement amount of the mouse is 0 and the screen does not need to be updated. Accordingly, the pixel operation unit 207 is provided in the image memory 20.
Since the pixel 8 is not operated, the screen remains as it is.

Next, in step S603 of FIG. 6, if the amount of movement detected in step S601 is not 0, the position of the mouse cursor on the monitor screen is redrawn in step S604. Performs drawing to delete the mouse cursor. At this time,
In FIG. 2, the movement amount detection unit 202 determines that the movement amount of the mouse is 0.
Is output to the display control unit 206. Further, the movement amount detection unit 202 determines the amount of movement of the mouse by the display position
Output to 3. The display position determining unit 203 outputs a destination display position based on the current display position of the display position storage unit 204. The display control unit 206 controls the screen update because the mouse movement amount is not 0. To update the screen, the display control unit 206 outputs to the pixel operation unit 207 the output of the display position storage unit 204 that stores the current display position of the mouse cursor and the output of the shape determination unit 205 that outputs mouse cursor shape data. I do.

Here, for example, the color channel of the pixel is set to 1
It is assumed that the channel is a channel and the quantization bit is 8 bits. Since one channel has 8 bits, the number of pixel gradations is 256, the minimum value of the pixel gradation is 0, and the maximum value of the pixel gradation is 255. Further, the constant given in advance is 128. Pixel operation unit 207
Then, in the area of horizontal pixels × vertical pixels of the shape determining unit 205 with the display position of the display position storage unit 204 as the upper left corner,
The pixel value of each color channel of the pixel superimposed on the mouse cursor is read into the pixel operation unit 207, and the pixel value obtained by adding the constant 128 given in advance by the pixel addition unit 209 is stored in the image memory 2.
By writing to 08, the mouse cursor can be deleted from the monitor screen.

Next, in step S605 of FIG. 6, a mouse cursor is drawn at the destination position. At this time, in FIG. 2, the display control unit 206 compares the output of the display position determination unit 203 that outputs the position of the destination of the mouse cursor and the output of the shape determination unit 205 that outputs the shape data of the mouse cursor with the pixel operation unit 207. Output to Pixel operation unit 207
In the image memory 208, in the area of the horizontal pixel × vertical pixel of the shape determining unit 205 where the display position of the display position determining unit 203 is the upper left corner, each color channel of the pixel overlapping with the shape data where the mouse cursor exists is displayed. By reading the pixel value into the pixel operation unit 207 and writing the pixel value obtained by adding the previously given constant 128 by the pixel addition unit 209 into the image memory 208, the mouse cursor at the movement destination can be displayed. When the pixel value overflows beyond 255 due to the addition, the pixel gradation number 256 is subtracted, and when the pixel value underflows by interrupting 0, the pixel gradation number 256 is added.

For example, when the background pixel value to be superimposed on the mouse cursor is 129 and a predetermined constant 128 is added, the overflow is 129 + 128 = 257, so that 256 minus 257−256 = 1 is the pixel of the mouse cursor. Value.

Next, in step S605 of FIG. 6, the position where the mouse cursor is moved is updated as the current position for the next movement. At this time, in FIG. 2, the display position control unit 206 writes the output of the display position determination unit 203 that outputs the position of the destination of the mouse cursor to the display position storage unit 204 that stores the current position of the mouse cursor. Next, FIG.
After the current position is updated in step S605, the flow returns to before the movement amount detection in step S601, and the movement amount of the mouse is detected again.

The operation of the pixel adder 209, which is a feature of the present invention, will be described with reference to FIG.

FIG. 1 is a diagram for explaining output characteristics of an overlay pixel value according to the first embodiment of the present invention.
In FIG. 1, the pixel value of the background image at the position where the mouse cursor is displayed is x, the pixel value of the mouse cursor is y, the color channel of the pixel is one channel, the quantization bit is 8 bits, and the constant given in advance is the pixel gradation. 12 which is half the number
When the mouse cursor pixel value is set to 8, the mouse cursor pixel value becomes y = x + 128 obtained by adding a predetermined constant to the background pixel value.
The graph shown in FIG. In order to make it easy to understand the state of the mouse cursor pixel value with respect to the background pixel value, y = x in which the background pixel value is used as the mouse cursor pixel value is shown in Graph 1.
01. At this time, for example, when a uniform screen with a luminance of 127 is displayed, the luminance of the mouse cursor display becomes a value of 255 shown at the position 103, and the difference between the background pixel and the luminance of the 104 (value of 128) is obtained. Therefore, the mouse cursor can be recognized with respect to peripheral pixels. In FIG. 1, since the constant given in advance is 128, the difference in luminance is 128, which is half the number of pixel gradations.
Becomes constant.

As described above, in the overlay display control device of the first embodiment, the pixel value of the mouse cursor is set to a value obtained by adding the constant 128 given in advance to the pixel value of the background image. Whatever the pixel value of the background image at the position where is displayed, the pixel value of the mouse cursor is different, so that it is possible to obtain a mouse cursor that can be easily distinguished from the peripheral image.

When the predetermined constant is 128, which is a half value of the number of pixel gradations, the pixel value of the mouse cursor always includes the pixel gradation number with respect to the pixel value of each color channel of the background image. A fixed difference of 128, which is a half value, can be provided.

In the first embodiment, the color channel of the pixel is 1 channel, the quantization bit is 8 bits, and the predetermined constant is 128. However, the color channel, the quantization bit, and the predetermined constant are arbitrary. The same can be performed with the value of.

In the first embodiment, only the case where the overlay display control using the mouse cursor is performed by a method of adding a predetermined constant to the pixel value of the portion where the overlay display is superimposed has been described. However, the embodiment described here is merely an example, and is not necessarily limited to this.

(Embodiment 2) FIG. 7 is a block diagram for explaining an overlay display control apparatus according to Embodiment 2 of the present invention. The overlay display control device according to the second embodiment includes an input device 701 such as a keyboard key for moving a text cursor associated with the operator by typing on the monitor screen, and an amount of movement of the keyboard key on the monitor screen. A movement amount detection unit 702 that detects a movement amount to correspond to the movement of the text cursor.
, Display position storage unit 704, and display position storage unit 704
And a display position determining unit 703 that outputs a position moved by the moving amount of the moving amount detecting unit 702 from the position of the upper left corner, which is the current display position of the text cursor stored in the area of the horizontal pixel × vertical pixel. A shape determination unit 705 that outputs shape data of a text cursor to be represented, and a display control unit 706 that controls input and output of a display position determination unit 703, a display position storage unit 704, a shape determination unit 705, and a pixel operation unit 707.
And an image memory 708 storing pixel values of an image output on the monitor screen, and a pixel stored in the image memory 708 based on an input from the display control unit 706 to erase and update the overlay display. A pixel operation unit 707 to be taken out;
A pixel adding unit 710 for adding a predetermined constant when the extracted pixel value is within a predetermined value range; and a pixel adding unit 710 when the extracted pixel value is out of the predetermined value range. A pixel inverting unit 711 that subtracts the pixel value from the maximum value of the pixel gradation of the pixel and an image storage buffer 709 that stores the pixel value of the background image originally displayed at the position where the text cursor is currently displayed. It is configured.

Here, the operation timing of the overlay display control device according to the second embodiment will be described with reference to the flowchart of FIG. FIG. 8 is a flowchart showing a processing procedure of the overlay display control device according to the second embodiment of the present invention. In FIG. 8, first, in step S801, a predetermined movement amount by typing of the keyboard is detected. At this time, the amount of movement of the text cursor placed between the texts or on the text differs depending on the editing device. In this case, the text cursor is moved between characters arranged at regular intervals by typing up, down, left, and right keys of the keyboard. Is moved in the direction corresponding to the predetermined amount. This movement amount is output as the movement amount of the text cursor on the monitor screen. Next, step S80
In 2, if the movement amount detected in step S801 is 0, the process returns to step S801 and the operation of movement amount detection is performed again. Therefore, if there is no keyboard typing, the operations of steps S801 and S802 are repeated. At this time, in FIG. 7, the movement amount detection unit 702 outputs to the display control unit 706 that the detected movement amount is 0. The display control unit 706 does not output anything to the pixel operation unit 707 because the movement amount is 0 and the screen does not need to be updated. Therefore, since the pixel operation unit 707 does not operate the pixels of the image memory 708, the screen remains unchanged.

Next, in step S802 in FIG. 8, if the movement amount detected in step S801 is not 0, first, in order to redraw the position of the text cursor on the monitor screen in step S803, the position currently displayed is changed. Performs drawing to delete the text cursor of. At this time, in FIG. 7, the movement amount detection unit 702 outputs to the display control unit 706 that the detected movement amount is not 0. Further, the movement amount detection unit 702 outputs the detected movement amount to the display position determination unit 703. The display position determination unit 703 outputs the display position of the movement destination based on the current display position of the display position storage unit 704. The display control unit 706 controls the screen update because the movement amount is not 0. To update the screen, the display control unit 706 outputs to the pixel operation unit 707 the output of the display position storage unit 704 that stores the current display position of the text cursor and the output of the shape determination unit 705 that outputs the shape data of the text cursor. I do. Image storage buffer 7
09 stores a background image of horizontal pixels × vertical pixels of the shape determining unit 705 having the display position of the display position storage unit 704 as the upper left corner. The pixel operation unit 707 reads the background image stored in the image storage buffer 709 and writes the text image into the image memory 708 having the display position in the display position storage unit 704 as the upper left corner, thereby deleting the text cursor from the monitor screen. be able to.

Next, in step S804 in FIG. 8, the background image at the destination position is stored in the image storage buffer 709. At this time, in FIG. 7, the display control unit 706 outputs the output of the display position determining unit 703 that outputs the position of the destination of the text cursor and the output of the shape determining unit 705 that outputs the shape data of the text cursor to the pixel operating unit 707. Output to The pixel operation unit 707 reads the background image of horizontal pixels × vertical pixels of the shape determining unit 705 having the display position of the display position determining unit 703 stored in the image memory 708 as the upper left corner, and writes the background image in the image storage buffer 709. Thus, the background image at the position where the text cursor required at the next update is displayed can be saved.

Next, in step S805 in FIG. 8, a text cursor is drawn at the destination position. At this time, FIG.
, The shape determining unit 705 that sets the display position of the display position determining unit 703 stored in the image memory 708 to the upper left corner
The pixel value of each color channel of the pixel to be superimposed on the shape data where the text cursor exists is read into the pixel operation unit 707 in the area of horizontal pixels × vertical pixels. If the read pixel value is within a predetermined value range, the pixel adding unit 71
0 is a value obtained by adding a predetermined constant to the image memory 708, and if the value is out of the predetermined value range, a value obtained by subtracting the read pixel value from the maximum value of the pixel gradation by the pixel inversion unit 711 is obtained. By writing to the image memory 708, a destination text cursor can be displayed. If the pixel value overflows due to the addition, the number of pixel gradations is subtracted, and if the pixel value overflows, the number of pixel gradations is added.

Next, in step S806 in FIG. 8, the position of the destination of the text cursor is updated as the current position for the next movement. At this time, in FIG. 7, the display position control unit 706 writes the output of the display position determination unit 703 that outputs the destination position of the text cursor to the display position storage unit 704 that stores the current position of the text cursor. Next, after the current position is updated in step S806 in FIG. 8, the process returns to before the movement amount detection in step S801, and the movement amount due to keyboard typing is detected again.

The operation of the pixel adding unit 710 and the pixel inverting unit 711, which is a feature of the present invention, will be described with reference to FIG. FIG. 9 is a diagram for explaining output characteristics of overlay pixel values according to Embodiment 2 of the present invention. In FIG. 9, the pixel value of the background image at the position where the text cursor is displayed is x, the pixel value of the text cursor is y, the color channel of the pixel is one channel, the quantization bit is 8 bits, the constant given in advance is 128, 63 <x
<192. The text cursor pixel value is 0 ≦ x ≦ 63 or 192 where the background pixel value is outside the predetermined range.
In the case of ≤x≤255, the value obtained by subtracting the background pixel value from the maximum value of the pixel gradation is y = 255-x, and in the case of 64≤x≤191 where the background pixel value is within a predetermined range,
Since 128 is added to the background pixel value, y = x + 128, and a graph 902 is obtained. In order to make it easy to understand the state of the text cursor pixel value with respect to the background pixel value, the background pixel value is used as the text cursor pixel value as it is.
= X is shown in the graph 901. At this time, for example, the luminance 31
Is displayed, the brightness of the text cursor display is a value of 224 shown at the position 903, and has a difference between the background pixel and the brightness of the pixel 904 (value of 193). In contrast, a text cursor can be recognized.

As described above, in the overlay display control apparatus according to the second embodiment, when the pixel value of the background image is within the range of the predetermined value, the pixel value of the text cursor is set to the pixel value of the background image. The value obtained by adding the given constant is used as the pixel value of the text cursor. If the pixel value of the background image is out of the range of the value given in advance, the value obtained by subtracting the pixel value of the background image from the maximum value of the pixel gradation is obtained. Since the pixel value of the text cursor is used, the pixel value of the text cursor is different regardless of the pixel value of the background image at the position where the text cursor is displayed. You can get a text cursor.

In the second embodiment, the overlay display control using the text cursor is performed by adding a predetermined constant to the pixel value of the portion where the overlay is superimposed,
Although only the case where the method is implemented by subtracting the pixel value of the background image from the maximum value of the pixel gradation has been described, the embodiment shown here is merely an example and is not necessarily limited to this.

(Embodiment 3) FIG. 10 is a diagram for explaining a window moving frame displayed on a monitor screen according to Embodiment 3 of the present invention. In FIG. 10, 10
Reference numeral 01 denotes a window, and a square frame of 1002 represents a destination window moving frame. The window frame is
It is represented by a rectangular frame that includes the upper left corner position 1003 and the lower right corner position 1004 as diagonal vertices. The window moving frame appears when the mouse cursor 1005 clicks and moves the window moving start portion 1006 of the window while dragging, and indicates the moving destination of the window.

FIG. 11 is a block diagram for explaining an overlay display control device according to the third embodiment of the present invention. In FIG. 11, the overlay display control apparatus using the window moving frame according to the third embodiment allows the operator to click on the window moving start portion and move the window moving frame while dragging the window moving frame on the monitor screen. Input device 1101 such as mouse to be moved
A movement amount detection unit 1102 that detects the movement amount of the mouse to associate the movement amount of the mouse with the movement of the window movement frame on the monitor screen, and outputs this value as the movement amount of the window movement frame on the monitor screen. , Display position storage unit 11
04, a display position determination unit 1103 that outputs a position moved by the movement amount of the movement amount detection unit 1102 from the position of the upper left corner which is the current display position of the window movement frame stored in the display position storage unit 1104, and A shape determining unit 1105 for generating and outputting shape data of a window moving frame represented by an area of horizontal pixels × vertical pixels having the same size as the window size, a display position determining unit 1103, a display position storage unit 1104, Shape determination unit 1105 and pixel operation unit 1107
Display control unit 1106 for controlling the input and output of the image, and image memory 11 for storing the pixel values of the image output on the monitor screen
08 and the image memory 110 based on the input from the display control unit 1106 to delete and update the window moving frame.
A pixel operation unit 1107 for extracting a pixel from the pixel 8 and a pixel having a maximum or minimum pixel gradation depending on the pixel value of a pixel in a portion where a window moving frame is superimposed among pixels displayed on the screen. Pixel processing unit 111 that gives
1, an image storage buffer 1109 that stores the background image originally displayed at the position where the window moving frame is currently displayed, and an upper left position that is the current display position of the window held by the system of the entire apparatus. A system information output unit 11 that outputs the position of the corner to the display position storage unit 1104 and outputs the size of the window to the shape determination unit 1105
10.

The operation timing of the overlay display control device according to the third embodiment will be described with reference to the flowchart of FIG. FIG. 12 is a flowchart showing a processing procedure of the overlay display control device according to the third embodiment of the present invention. In FIG. 12, first, in step S1
In step 201, when the window movement start portion is clicked with the mouse, system information on the window is acquired from the system of the entire apparatus. At this time, in FIG. 11, the system information output unit 1110 outputs the position of the upper left corner, which is the current display position of the window held by the system, to the display position storage unit 1104, and the window size to the shape determination unit 1105. Output. Shape determination unit 11
In step 05, window frame shape data is created in a region of vertical pixels × horizontal pixels of the window size acquired from the system information output unit 1110, and the display control unit 1106
Output to

Next, in step S1202 in FIG.
Detects the amount of mouse movement. In step S1203,
If the movement amount detected in step S1202 is 0, the process returns to step S1202 and the operation of movement amount detection is performed again. Therefore, when there is no movement of the mouse, the operations of steps S1202 and S1203 are repeated. At this time, in FIG.
2 indicates that the movement amount of the mouse is zero.
6 is output. In the display control unit 1106, since the movement amount of the mouse is 0 and there is no need to update the screen, the pixel operation unit 1107
No output for. Therefore, since the pixel operation unit 1107 does not operate the pixels of the image memory 1108, the screen remains unchanged.

Next, in step S1204 of FIG. 12, if the movement amount detected in step S1203 is not 0, the window at the currently displayed position is first redrawn in order to redraw the position of the window movement frame on the monitor screen. Perform drawing to delete the moving frame. At this time, in FIG. 11, the movement amount detection unit 1102 outputs to the display control unit 1106 that the movement amount of the mouse is not 0. The movement amount detection unit 1102 calculates the movement amount of the mouse by using the display position determination unit 110.
Output to 3. The display position determination unit 1103 outputs the display position of the movement destination based on the current display position of the display position storage unit 1104. Since the mouse movement amount is not 0, the display control unit 1106 controls screen updating. To update the screen, the display control unit 1106 outputs the output of the display position storage unit 1104 that stores the current display position of the window moving frame, and the shape determining unit 11 that outputs the shape data of the window moving frame.
05 is output to the pixel operation unit 1107. The image storage buffer 1109 stores the display position of the display position storage unit 1104 in the image memory 1108 as the upper left corner, and adds the vertical and horizontal sizes of the shape data of the shape determining unit 1105 to the position of the upper left corner to the right. A background image of horizontal pixels × vertical pixels surrounded by a square having diagonal vertices at the lower corner is stored.
The pixel operation unit 1107 reads the background image stored in the image storage buffer 1109 and reads the background image.
By writing into the image memory 1108 with the display position of 104 as the upper left corner, the window moving frame can be deleted from the monitor screen.

Next, in step S1205 in FIG. 12, the background image at the destination position is stored in the buffer. At this time, in FIG. 11, the display control unit 1106 outputs the position of the destination of the window moving frame to the display position determining unit 11.
03 and the output of the shape determination unit 1105 that outputs the shape data of the window moving frame are output to the pixel operation unit 1107. The pixel operation unit 1107 includes an image memory 1108
Is the display position of the display position determining unit 1103 stored in the upper left corner of the destination window, and the position obtained by adding the vertical and horizontal sizes of the shape data of the shape determining unit 1105 to the position of the upper left corner is referred to as the lower right corner. A background image of a position where a window moving frame required for the next update is stored by reading a background image of horizontal pixels × vertical pixels surrounded by a square having a diagonal vertex and writing the image in the image storage buffer 1109. can do.

Next, in step S1206 in FIG. 12, a window moving frame is drawn at the destination position. At this time,
In FIG. 11, a pixel operation unit 1107 includes an image memory 1
In the area of the horizontal pixel × vertical pixel of the shape determining unit 1105 having the display position of the display position determining unit 1103 stored at 108 in the upper left corner, each color channel of the pixel overlapping the shape data in which the window moving frame exists exists The pixel value is read into the pixel operation unit 1107, and if the pixel value is smaller than the predetermined threshold value, the pixel processing unit 1111 writes the maximum value of the pixel gradation in the pixel into the image memory 1108, and the pixel value is set to the predetermined threshold value. In the above case, the pixel processing unit 1111 writes the minimum value of the pixel gradation to the pixel in the image memory 1108, so that the destination window moving frame can be displayed.

Next, in step S1207 of FIG. 12, the destination position of the window moving frame is updated as the current position for the next movement. At this time, in FIG. 11, the display position control unit 1106 writes the output of the display position determination unit 1103 that outputs the position of the destination of the window movement frame to the display position storage unit 1104 that stores the current position of the window movement frame. Next, after the current position is updated in step S1207 in FIG. 12, the process returns to before the movement amount detection in step S1201 and the movement amount of the mouse is detected again.

The operation of the pixel processing section 1111 which is a feature of the present invention will be described with reference to FIG. FIG. 13 is a diagram for describing output characteristics of an overlay pixel value according to the third embodiment of the present invention. In FIG. 13, the pixel value of the background image at the position where the window moving frame is displayed is x, the pixel value of the window moving frame is y, the color channel of the pixel is one channel, the quantization bit is 8 bits, and the threshold given in advance is 127. .5. When the background pixel value is 0 ≦ x ≦ 127, the pixel processing unit 1111 gives the maximum value 255 of the pixel gradation, and the window pixel value is 128 ≦
When x ≦ 255, the minimum value 0 of the pixel gradation is given. Then, a graph shown in 1302 is obtained. A graph 1301 shows y = x in which the background pixel value is used as the window moving frame pixel value in order to easily understand the state of the window moving frame pixel value with respect to the background pixel value. At this time, for example, when a uniform screen with a luminance of 127 is displayed, the luminance of the window moving frame has a value of 255 shown at the position 1303, and the difference between the background pixel and the luminance shown in 1304 (12
8), it is possible to recognize the window moving frame for the peripheral pixels. In FIG. 13, the threshold value is 127.5, which is half of the maximum value of the pixel gradation. Therefore, the difference in luminance is at least 128, which is half the number of pixel gradations.

As described above, in the overlay display control device according to the third embodiment, when the pixel value of the window moving frame is smaller than the predetermined threshold value, the maximum value of the pixel When the pixel value of the background image is equal to or larger than a predetermined threshold value, the minimum value of the pixel gradation is set to be the pixel value of the window moving frame. Regardless of the value of the pixel value of the background image, the pixel value of the window moving frame is different, so that a window moving frame that can be easily distinguished from the peripheral image can be obtained. When the threshold given in advance is set to half of the maximum value of the pixel gradation, the pixel value of the window moving frame is always equal to or more than half the number of pixel gradations with respect to the pixel value of each color channel of the background image. You can make a difference.

Further, in the third embodiment, the overlay display control using the window moving frame is performed by giving the maximum value of the pixel gradation to the pixel value of the portion where the overlay display is superimposed or by setting the minimum value of the pixel gradation. Has been described, but the embodiment shown here is merely an example, and the present invention is not necessarily limited to this.

(Embodiment 4) FIG. 14 is a diagram for explaining a window size change frame displayed on a monitor screen according to Embodiment 4 of the present invention. In FIG. 14, reference numeral 1401 denotes a window, and a square frame 1402 indicates a window size change frame. The window size change frame 1402 is represented by a square frame including an end point position 1404 that forms a diagonal vertex with the start point position 1403. In the window size change frame 1402, a start point 1403 is determined by clicking the thick line window size change start portion 1405 with the mouse cursor 1406, and the end point 1404 is moved by moving the mouse cursor 1406 while being dragged. Appears as a diagonal vertex, and the size of the square frame indicates the window size after the change.

FIG. 15 is a block diagram for explaining an overlay display control device according to the fourth embodiment of the present invention. The overlay display control device according to the fourth embodiment includes an input device such as a mouse that enlarges or reduces the associated window moving frame on the monitor screen by clicking and dragging the window size change start portion by the operator. A movement amount detection unit 1502 for detecting a movement amount for associating the movement amount of the mouse with the movement of the end point position on the monitor screen, and outputting this value as the movement amount of the end point position on the monitor screen; Storage unit 1
504, an end point position determination unit 1503 that outputs a position of the window size change frame stored in the end point position storage unit 1504 that is moved from the current end position by the movement amount of the movement amount detection unit 1502, and a window size change frame. Display control which controls the input and output of a shape determining unit 1505 which creates and outputs the shape data of the image, and an end point position determining unit 1503, an end point position storage unit 1504, a shape determining unit 1505, a pixel operation unit 1507, and a system information output unit 1509. Part 1506
And the image memory 15 based on the input from the display control unit 1506 to delete and update the window size change frame.
08, a pixel operation unit 1507 for extracting a pixel value from the pixel operation unit 1507, a pixel addition unit 1510 for adding a predetermined constant pixel value to a pixel value of the foreground image extracted by the pixel operation unit 1507, and an image output on the monitor screen. An image memory 1508 that stores pixel values and a system information output unit 1509 that outputs information held by the system of the entire apparatus are provided.

The operation timing of the overlay display control device according to the fourth embodiment will be described with reference to the flowchart of FIG. FIG. 16 is a flowchart showing a processing procedure of the overlay display control device according to the fourth embodiment of the present invention. In FIG. 16, first, in step S1
In 601, when the window size change start portion is clicked with the mouse, the system information output unit 1509
Outputs two pieces of information held by the system. If the portion clicked by the mouse is the window resizing start portion located at the lower right corner of the window, the position of the upper left corner of the currently displayed position of the window is output to the shape determining unit 1505 as the starting point, and the window is output to the shape determining unit 1505. The position of the lower right corner of the currently displayed position is output to the end point position storage unit 1504 as the end point position.

Next, in step S1602 of FIG. 16, the amount of movement of the mouse is detected. In step S1603, if the movement amount detected in step S1602 is 0, the process returns to step S1602 and the operation of movement amount detection is performed again. Therefore, if there is no mouse movement, step S
1602, the operation of step S1603 is repeated. At this time, in FIG.
Indicates that the moving amount of the mouse is 0.
Output to The display control unit 1506 does not output anything to the pixel operation unit 1507 because the moving amount of the mouse is 0 and there is no need to update the screen. Therefore, since the pixel operation unit 1507 does not operate the pixels of the image memory 1508, the screen remains unchanged.

Next, in step S1604 in FIG. 16, if the movement amount detected in step S1603 is not 0, first, the window size change frame currently displayed is displayed in order to redraw the window size change frame on the monitor screen. Perform drawing to erase. At this time, in FIG. 15, the movement amount detection unit 1502 outputs to the display control unit 1506 that the movement amount of the mouse is not 0. Further, the movement amount detection unit 1502 determines the movement amount of the mouse by the end point position determination unit 150.
Output to 3. The end point position determination unit 1503 outputs the destination end position based on the current end point position in the end point position storage unit 1504. The display control unit 1506 controls the screen update because the mouse movement amount is not 0. First, the display control unit 1506 outputs the output of the end point position determining unit 1503 to the shape determining unit 1505 in order to create the shape data of the window size change frame since the end position is determined by moving the mouse. In the shape determining unit 1505, a square vertical pixel × horizontal pixel including two points of a start point position obtained from the system information output unit stored in the image memory 1508 and an end point position of the end point position storage unit 1504 as diagonal vertices. In the minute area, shape data of the window size change frame is created and output to the display control unit 1506. Next, in order to update the screen, the display control unit 1506 outputs the start position acquired from the system information output unit 1509, the output of the end position storage unit 1504 storing the current end position of the window size change frame, and the window size change. The output of the shape determination unit 1505 that outputs the frame shape data is output to the pixel operation unit 1507. In the pixel operation unit 1507, the window size change frame shape data including two points of the start point position acquired by the display control unit 1506 and the end point position of the end point position storage unit 1504 stored in the image memory 1508 as diagonal vertices. In the area of horizontal pixels x vertical pixels,
By reading the pixel value of each color channel of the pixel superimposed on the shape data in which the window size change frame exists, and writing the pixel value obtained by adding the constant given in advance by the pixel addition unit 1510 to the image memory 1508, the window size change frame is obtained. It can be deleted from the monitor screen. If the pixel value overflows due to the addition, the number of pixel gradations is subtracted. If the pixel value underflows, the number of pixel gradations is added.

Next, in step S1605 in FIG. 16, a window size change frame is drawn at the destination position. At this time, in FIG. 15, the display control unit 1506 outputs the start point position acquired from the system information output unit 1509, the output of the end point position determination unit 1503 that outputs the changed end point position of the window size change frame, and the window size change frame. The output of the shape determination unit 1505 that outputs the start point position of the pixel is output to the pixel operation unit 1507. The pixel operation unit 1507 includes a display control unit 1506 stored in the image memory 1508.
In the area of the horizontal pixel × vertical pixel of the window size change frame shape data including the two points of the start point position and the end point position of the end point position determination unit 1503 obtained as the diagonal vertices, the shape data in which the window size change frame exists Is read into the pixel operation unit 1507. By drawing in the image memory 1508 the pixel value obtained by adding the above given constant by the pixel addition unit 1510, the window size change frame after the change can be displayed. If the pixel value overflows due to the addition, the number of pixel gradations is subtracted. If the pixel value underflows, the number of pixel gradations is added.

Next, in step S1606 in FIG. 16, the updated end point position of the window size change frame is updated as the current end point position for the next enlargement or reduction. At this time, in FIG. 15, the end point position control unit 1506 outputs the output of the end point position determination unit 1503 that outputs the changed end point position of the window size change frame to the end point position storage unit that stores the current end point position of the window size change frame. By writing to window 1504, a window size change frame can be displayed. Next, after the current end point position is updated in step S1606 in FIG. 16, the process returns to before the movement amount detection in step S1601 and the movement amount of the mouse is detected again.

The operation of the pixel adder 1510, which is a feature of the present invention, will be described with reference to FIG. The pixel value of the background image at the position where the window moving frame is displayed is x, the pixel value of the window moving frame is y, the color channel of the pixel is one channel, the quantization bit is 8 bits, and a predetermined constant is 128.
In this case, the window moving frame pixel value becomes y = x + 128 obtained by adding a constant given in advance to the background pixel value.
The graph shown in FIG. In order to make the state of the window moving frame pixel value relative to the background pixel value easy to understand, the graph 101 is shown as y = x where the background pixel value is the window moving frame pixel value as it is. At this time, for example, when a uniform screen with a luminance of 127 is displayed, the luminance of the window moving frame display is a value of 255 shown at the position 103, and the difference between the background pixel and the luminance of the 104 (value of 128) Therefore, the window moving frame can be recognized for the peripheral pixels. In FIG. 1, since the constant given in advance is 128, which is half the value of the number of pixel gradations, the luminance difference is constant at 128, which is half the value of the number of pixel gradations.

As described above, in the overlay display control device according to the fourth embodiment, the pixel value of the window size change frame is a value obtained by adding a constant given in advance to the pixel value of the background image. Regardless of the value of the pixel value of the background image at the position where the size change frame is displayed, the pixel value of the window size change frame has a different value, so that a window size change frame that is easily distinguishable from the surrounding image is obtained. be able to.

When the constant given in advance is half the value of the number of pixel gradations, the pixel value of the window size change frame always includes the number of pixel gradations with respect to the pixel value of each color channel of the background image. A constant difference of half the value can be provided.

In the fourth embodiment, only the case where the overlay display control using the window size change frame is performed by a method of adding a predetermined constant to the pixel value of the portion where the overlay display is superimposed will be described. However, the embodiment shown here is merely an example, and is not necessarily limited to this. Further, in the fourth embodiment, only the display control of the window size change frame displayed on the monitor screen has been described. However, the same can be applied to the display control of the range selection frame displayed on the monitor screen.

[0066]

As described above, according to the overlay display control apparatus according to the present invention (claim 1), the overlay display control apparatus performs overlay display by superimposing a foreground image on a background image displayed on a screen. A display position determining unit that determines a display position of the foreground image, a shape determining unit that determines a shape of the foreground image, an image storage unit that stores pixel values of the background image, and a storage unit that is stored in the image storage unit. A pixel operation unit that extracts a pixel included in an area having a shape determined by the shape determination unit at a position determined by the display position determination unit in the background image that is being processed; A pixel addition unit that adds a predetermined constant pixel value to the pixel value of the extracted background image, sends the added pixel value to the image storage unit, and displays an overlay on the screen. Since so and a pixel value of each color channel of the position of the background image to the overlay display, the pixel values of the overlay display will be different,
An overlay display image that can be easily distinguished from the peripheral image can be obtained.

According to the present invention (claim 2), claim 1
In the overlay display control device described in the above, by adding the above given constant, the number of pixel gradations is subtracted when the quantization bit overflows, and the number of pixel gradations is added when the quantization bit overflows, Even if the overlay pixel value overflows or underflows, the difference between the background pixel value and the overlay pixel value can be made a certain value or more by the addition of the above-mentioned predetermined constant, whereby the peripheral image can be distinguished from the surrounding image. It is possible to obtain an overlay display image that is easy to perform.

According to the present invention (Claim 3), Claim 2
In the overlay display control device described above, the constant given in advance is set to a value that is half of the number of pixel gradations.
Regardless of the pixel value of each color channel of the background image at the position where the overlay is displayed, the pixel value of the overlay must have a constant difference of half the number of pixel gradations and the maximum difference. This makes it possible to obtain an overlay that is easily distinguishable from the peripheral image.

According to the overlay display control device of the present invention (claim 4), in the overlay display control device for performing overlay display by superimposing a foreground image on a background image displayed on a screen, A display position determining unit that determines a display position, a shape determining unit that determines a shape of the foreground image, an image storage unit that stores pixel values of the background image, and a background image stored in the image storage unit. Among them, at the position determined by the display position determining unit, a pixel operating unit that extracts a pixel included in an area having a shape determined by the shape determining unit, and among the pixels displayed on the screen, A pixel adding unit that adds a predetermined constant to the pixel value of the portion where the overlay is to be superimposed if the pixel value is within a predetermined value range; When the value is out of the predetermined value range, a pixel inverting unit that subtracts the pixel value from the maximum value of the pixel gradation of the pixel value is provided, so that the background image of the position where the overlay is displayed is displayed. Regardless of the pixel value of each color channel, since the pixel value of the overlay display is different, it is possible to obtain an overlay display image that is easily distinguishable from the peripheral image.

According to the overlay display control device of the present invention (claim 5), in the overlay display control device for performing overlay display by superimposing a foreground image on a background image displayed on a screen, A display position determining unit that determines a display position, a shape determining unit that determines a shape of the foreground image, an image storage unit that stores pixel values of the background image, and a background image stored in the image storage unit. Among them, at the position determined by the display position determining unit, a pixel operating unit that extracts a pixel included in an area having a shape determined by the shape determining unit, and among the pixels displayed on the screen, If the pixel value of the portion where the overlay is to be superimposed is smaller than a predetermined threshold value, the maximum value of the pixel gradation is given to the pixel, and the pixel value is set to the predetermined value. A pixel processing unit that gives the minimum value of the pixel gradation to the pixel when the threshold value is equal to or more than the given threshold value is provided, so that the pixel value of each color channel of the background image at the position where the overlay display is performed is determined. Even so, an overlay display image that is easy to distinguish from the peripheral image can be obtained because the pixel values of the overlay display are different.

According to the present invention (claim 6), claim 5
In the overlay display control device described above, the threshold value given in advance is set to half of the maximum value of the pixel gradation, so that the pixel value of each color channel of the background image at the position where the overlay is displayed is determined. Even so, the pixel value of the overlay display can have a difference equal to or more than half the number of pixel gradations, thereby obtaining an overlay display image that can be easily distinguished from the peripheral image.

According to the present invention (claim 7), claim 1
The overlay display control device according to any one of claims 1 to 6, wherein the shape of the overlay display determined by the shape determining means is such that the shape of the mouse cursor is created. Whatever the pixel value of the background image is, the pixel value of the mouse cursor is different, so that it is possible to obtain a mouse cursor that can be easily distinguished from the peripheral image.

According to the present invention (claim 8), claim 1
The overlay display control device according to any one of claims 1 to 6, wherein the shape of the overlay display determined by the shape determination means is such that a shape of a text cursor indicating a position at which a character is edited at the time of text editing is created. Therefore, no matter what the pixel value of the background image at the position where the text cursor is displayed, the text cursor has a different pixel value, so that it is possible to obtain a text cursor that is easy to distinguish from the surrounding image.

According to the present invention (claim 9), claim 1
7. The overlay display control device according to claim 6, wherein the shape of the overlay display determined by the shape determining means is such that a shape of a window moving frame indicating a destination when the window is moved is created. Regardless of the pixel value of the background image at the position where the window moving frame is displayed, the window moving frame has a different pixel value, so that it is possible to obtain a window moving frame that can be easily distinguished from the peripheral image.

According to this invention (Claim 10), in the overlay display control device according to any one of Claims 1 to 6, the shape of the overlay display determined by the shape determining means is determined based on the size of the window. When changing the size, the shape of the window size change frame that indicates the size of the window after the change is created, so what is the value of the pixel value of the background image at the position where the window size change frame is displayed However, since the pixel values of the window size change frame are different from each other, it is possible to obtain a window size change frame that is easily distinguishable from the peripheral image.

According to the present invention (claim 11), in the overlay display control device according to any one of claims 1 to 6, the shape of the overlay display determined by the shape determining means is determined on the screen. Creates the shape of the range selection frame indicating the range to be edited, so that the pixel value of the range selection frame is different regardless of the pixel value of the background image at the position where the range selection frame is displayed Therefore, it is possible to obtain a range selection frame that is easily distinguishable from the peripheral image.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining output characteristics of an overlay pixel value in Embodiments 1 and 4 of the present invention.

FIG. 2 is a block diagram for explaining an overlay display control device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a state of overlay display drawn on a screen.

FIG. 4 is a diagram obtained by binarizing the overlay shape data shown in FIG.

FIG. 5 is a diagram illustrating output characteristics of an overlay pixel value in the related art.

FIG. 6 is a flowchart showing a processing procedure of the overlay display control device according to the first embodiment of the present invention.

FIG. 7 is a block diagram illustrating an overlay display control device according to a second embodiment of the present invention.

FIG. 8 is a flowchart showing a processing procedure of the overlay display control device according to the second embodiment of the present invention.

FIG. 9 is a diagram for explaining output characteristics of an overlay pixel value according to the second embodiment of the present invention.

FIG. 10 is a diagram illustrating a window moving frame displayed on a monitor screen according to Embodiment 3 of the present invention.

FIG. 11 is a block diagram illustrating an overlay display control device according to a third embodiment of the present invention.

FIG. 12 is a flowchart showing a processing procedure of the overlay display control device according to the third embodiment of the present invention.

FIG. 13 is a diagram for explaining output characteristics of an overlay pixel value according to the third embodiment of the present invention.

FIG. 14 is a diagram illustrating a window moving frame displayed on a monitor screen according to the fourth embodiment of the present invention.

FIG. 15 is a block diagram illustrating an overlay display control device according to a fourth embodiment of the present invention.

FIG. 16 is a flowchart showing a processing procedure of the overlay display control device according to the fourth embodiment of the present invention.

FIG. 17 is a block diagram for explaining a conventional overlay display control device.

[Explanation of symbols]

101, 502, 901, 1301 Graph showing background pixel values 102, 501, 902, 1302 Graph showing overlay pixel values 103, 505, 1303 Overlay pixel values when background pixel value is 127 Background pixel values 104, 506, 1304 Is the difference with the overlay pixel value when is 127. 201, 701, 1101, 1501, 1701 Input devices 202, 702, 1102, 1502, 1702 Movement amount detection units 203, 703, 1103, 1703 Display position determination units 204, 704, 1104, 1704 Display position storage unit 205, 705, 1105, 1505, 1705 Shape determination unit 206, 706, 1106, 1506, 1706 Display control unit 207, 707, 1107, 1507, 1707 Pixel operation unit 208, 708, 1108, 15 08, 1708 Image memory 209, 710, 1510 Pixel adder 301 Overlay pixel 302 Background pixel 401 Overlay shape data representing overlay pixel 402 Overlay shape data representing background pixel 503 Overlay pixel value when background pixel value is 63 504 Background pixel Difference from the overlay pixel value when the value is 63 709, 1109 Image storage buffer 711, 1709 Pixel inversion unit 903 Overlay pixel value when the background pixel value is 31 904 Difference between the overlay pixel value when the background pixel value is 31 Difference 1001, 1401 Window 1002 Window moving frame 1003 Upper left corner position 1004 Lower right corner position 1005, 1406 Mouse cursor 1006 Window movement start part 1110, 1509 System information output part 1111 Pixel processing part 14 02 Window size change frame 1403 Start point position 1404 End point position 1405 Window size change start part 1503 End point position determination unit 1504 End point position storage unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G09G 5/08 G09G 5/08 DE 5/14 5/14 C 5/36 5/36 520A 5/377 520N F-term (reference) 5B057 CA08 CA16 CB08 CB16 CE08 CH08 CH11 5B069 AA01 BA01 BA04 CA04 CA06 DD11 DD15 HA08 JA02 5C076 AA12 AA27 AA33 AA40 BA06 CA02 CA12 5C082 AA01 AA24 BA02 BA12 CA42 CA42 DA42 CA42

Claims (11)

[Claims] 1. An overlay display control device for performing overlay display by superimposing a foreground image on a background image displayed on a screen, comprising: a display position determining unit that determines a display position of the foreground image; A shape determination unit that determines a shape, an image storage unit that stores pixel values of the background image, and a position of the background image stored in the image storage unit that is determined by the display position determination unit. A pixel operation unit for extracting a pixel included in an area having a shape determined by the shape determination unit, and a constant pixel value given in advance to a pixel value of a background image extracted by the pixel operation unit, and the added An overlay display control device, comprising: a pixel addition unit that sends a pixel value to the image storage unit and performs overlay display on the screen. 2. The overlay display control device according to claim 1, wherein the number of pixel gradations is subtracted when the quantization bit overflows by adding the predetermined constant, and when the underflow occurs, the pixel gradation number is reduced. An overlay display control device for adding a tone. 3. The overlay display control device according to claim 2, wherein said predetermined constant is a half value of the number of pixel gradations. 4. An overlay display control device for performing overlay display by superimposing a foreground image on a background image displayed on a screen, comprising: a display position determining unit that determines a display position of the foreground image; A shape determination unit that determines a shape, an image storage unit that stores pixel values of the background image, and a position of the background image stored in the image storage unit that is determined by the display position determination unit. A pixel operation unit for extracting a pixel included in an area having a shape determined by the shape determination unit; and a pixel value of a pixel displayed on a screen in a portion where an overlay is superimposed. A pixel adding unit that adds a predetermined constant to the pixel value when the pixel value is within a predetermined value range; and a pixel adding unit that adds the pixel value when the pixel value is out of the predetermined value range. An overlay display control device, comprising: a pixel inverting unit that subtracts the pixel value from the maximum value of the elementary gradation. 5. An overlay display control device for performing overlay display by superimposing a foreground image on a background image displayed on a screen, comprising: a display position determining unit that determines a display position of the foreground image; A shape determination unit that determines a shape, an image storage unit that stores pixel values of the background image, and a position of the background image stored in the image storage unit that is determined by the display position determination unit. A pixel operation unit for extracting a pixel included in an area having a shape determined by the shape determination unit; and a pixel value of a pixel displayed on a screen in a portion where an overlay is superimposed. When the pixel value is less than a predetermined threshold, the maximum value of the pixel gradation is given to the pixel, and when the pixel value is equal to or more than the predetermined threshold, the minimum value of the pixel gradation is given to the pixel. Characterized by comprising a obtaining pixel processing unit, an overlay display control device. 6. The overlay display control device according to claim 5, wherein the predetermined threshold value is a half of the maximum value of the pixel gradation. 7. The overlay display control device according to claim 1, wherein the shape of the overlay determined by the shape determination unit is to create a shape of a mouse cursor. An overlay display control device. 8. The overlay display control device according to claim 1, wherein the shape of the overlay determined by the shape determining unit is a text cursor indicating a position at which a character is edited at the time of text editing. An overlay display control device, wherein the overlay display control device creates a shape of the overlay display. 9. The overlay display control device according to claim 1, wherein the shape of the overlay determined by the shape determination unit is a shape of a window moving frame indicating a destination when the window is moved. An overlay display control device, characterized in that an overlay display control device is created. 10. The overlay display control device according to claim 1, wherein the shape of the overlay determined by the shape determination unit is changed when the size of the window is changed. An overlay display control device for creating a shape of a window size change frame indicating the size of the window. 11. The overlay display control device according to claim 1, wherein the shape of the overlay determined by the shape determining unit is a range selection frame indicating a range to be edited on a screen. An overlay display control device for creating a shape.